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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...

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Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Compact on-chip interferometers with high spectral sensitivity.

Maysamreza Chamanzar1, Babak Momeni, Ali Adibi

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. chamanzar@gatech.edu

Optics Letters
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

New on-chip interferometers utilize photonic crystals for highly sensitive measurements. These devices offer potential in spectroscopy and sensing by mapping spectral information.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Nanotechnology

Background:

  • Interferometers are crucial for precise measurements.
  • On-chip integration offers miniaturization and enhanced functionality.
  • Photonic crystals provide unique optical properties.

Purpose of the Study:

  • To introduce novel on-chip interferometers.
  • To demonstrate the use of photonic crystals for enhanced sensitivity.
  • To explore applications in spectroscopy and sensing.

Main Methods:

  • Fabrication of on-chip interferometers incorporating photonic crystals.
  • Observation of spatial output interference patterns on a detection plane.
  • Characterization of wavelength sensitivity and spectral mapping capabilities.

Main Results:

  • Realization of highly sensitive interferometers using photonic crystals with strong dispersion.
  • Demonstration of spatial mapping of spectral information.
  • Validation of strong wavelength sensitivity.

Conclusions:

  • On-chip interferometers with photonic crystals offer a pathway to highly sensitive devices.
  • These interferometers show significant potential for advanced spectroscopy and sensing applications.
  • The ability to spatially map spectral information is a key advantage.